How to record a lecture and turn it into study notes and flashcards

Ask the teacher for permission. Rules about recording a lecture vary by school and by country, some teachers are happy with it and others are not, and this site cannot give you a legal answer that holds everywhere. Read your school’s rules and ask at the start of the term, it is easier than worrying about it before every class.

Once you have the green light, get ready before the lecture starts. Charge the phone, free up space, put it close enough to the teacher to hear them, and do a one minute test to listen back to the sound. Lecture halls often have an echo and voices that cover the teacher. A well placed microphone beats good software. Think of the people around you too, a recording also keeps their questions.

Taking notes live is a heavy task. You have to understand, pick what matters and write it down, all while still listening. Piolat, Olive and Kellogg report that note taking demands more effort than reading or learning, and less than composing an original text (Piolat et al., 2005). When you write everything, you listen less.

Attention also drops with duration. Risko and colleagues saw mind wandering rise during an hour long lecture, with memory for the lecture falling (Risko et al., 2012). A recording gives you a safety net. If you drift for two minutes, the passage is kept, and you can note just a few keywords, a question or an example that struck you. You listen more and copy less.

The most useful move is to handle the recording on the day of the lecture, while it is fresh. In Lumi, the audio becomes cards and questions, and you can read the cards with your keywords to check that they match what the teacher said. Delete the ones that are off topic, fix a doubtful name or figure, and keep one idea per card.

If you make the cards by hand, listen back in slices of ten minutes, pause, write what you remember, then compare. This work resembles Active recall, why quizzing yourself beats rereading and it is the part that counts, more than the quality of the transcript. Time works against you, as What Ebbinghaus’s forgetting curve really shows shows, so do not let the audio sleep for a week. For very dense courses, as in Law or Medicine, handle each lecture that same evening.

Listening to a whole lecture again is a lot like rereading it, and rereading gives a sense of mastery that does not hold. In the study by Roediger and Karpicke, between a test at 5 minutes and a test a week later, students who had reread forgot 52% of what they knew, against 14% for those who had quizzed themselves (Roediger and Karpicke, 2006).

So use the recording when a topic is missing, not as a second lecture. Find the passage, listen to it twice, then close everything and answer from memory. The rest of the time, go through the cards and questions. That takes far less time than a full second listen. If you still wonder whether to reread or to quiz yourself, Why rereading your notes is not enough compares the two with the numbers from the studies.

Knowt and Coconote also start from a recorded lecture. The table below only repeats what each home page says, read on 7 November 2026. Prices, length limits and transcription accuracy are not compared, because those pages do not give them and they change.

Lumi records up to 90 minutes, even with the screen locked, and turns it into cards and questions. The difference is what happens next. You teach those cards to Lumi, it forgets them over time, it quizzes you again at the right moment and the Mist rises before the exam. If you mainly want a full transcript or a summary, another tool may fit better. To compare study apps, see The best study apps in 2026, ranked on five criteria.